780-8 Series Constant Impedance FM Combiners

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Magdalen Spencer
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Features Cylindrical construction provides better mechanical and electrical stability than square or rectangular cavities Factory tuned to customer s specified channel, yet can be easily field

1 Features Cylindrical construction provides better mechanical and electrical stability than square or rectangular cavities Factory tuned to customer s specified channel, yet can be easily field converted to any FM channel Minor adjustments of cavity resonant frequency can be made during full power operation of filters High stability temperature compensated cavities ERI filters are loop coupled and fixed with bolted connections to couple cavities No Teflon or other insulating material used in the coupling between cavities, eliminating a primary point of failure, present in competitor s designs. Loop coupling provides an adjustment (without disassembly) at the input and output of each cavity Marman clamp connection allows close cavity placement Ability to change frequency quickly and with a minimum of disassembly Filter can be easily broken down for shipment and placement Temperature indicator provided on all filter sets Optional non-adjacent coupling and group delay compensation available Easily assembled floor standing units (hardware for ceiling suspension available on request) ERI FM filters and combiners have served the broadcast industry for over 40 years. The basic building block of ERI s combiner and multiplexers system is a unique filter cavity. Only ERI offers a cylindrical cavity and all internal components in the RF path are silver plated. The result is an extremely efficient (low loss) and stable filter. ERI filters include a unique bellows temperature compensation assembly which maintains filter performance from a cold start to normal operating temperature without causing high transmitter VSWR. Only ERI filters incorporate a loop coupled design that allows more control over the filter pass band and offers performance superior to what can be achieved with the iris coupled cavities used by other manufacturers. The use of cylindrical tanks provides the benefit of a mechanically rigid tank design. ERI s constant impedance combiner module is modular in construction and is designed so that additional stations may be added in the future. The frequency of the additional station may be located anywhere within the FM broadcast band 0.8 MHz or more from any other system frequency. The filter system offered is configured in a floor mounted configuration to maximize heat transfer, power handling capability, and simplify system modification in the future. The individual modules can be optionally forced air cooled, for higher power handling capability. There are also optional configurations that include ceiling hung frames and floor stands to accommodate a wide variety of physical space requirements. The combiner module can also be equipped with circulators for the dump load ports of the system to enable the capability or reverse feeding the combiner with the digital IBOC FM signals.

2 780-8 Series Constant Impedance Combiner Specifications: Model: Combiner Type: Band Pass Constant Impedance VSWR: 1.1:1 ±200kHz, maximum Injected Port to Broad Port Isolation: -30 db Injected Port to Injected Port Isolation: -55 db, with two or more modules Output Connector: 3-1/8-inch, 4-1/16-inch, or 6-1/8-inch EIA, 50 ohms Output Power Capability: 140 kw capability (limited by line size) Combiner Module Size and Weight: Convection cooled model: 3-1/8-inch Output Weight: 840 lbm 381 kg With forced air cooling: Height: 56 in 142 cm Weight: 1000 lbm 454 kg Convection cooled model: 6-1/8-inch Output Weight: 950 lbm 431 kg With forced air cooling: Height: 56 in 142 cm Weight: 1110 lbm 503 kg AC power required for forced air cooling: 115 VAC 4 amps Group Delay Compensation Module Size and Weight: Length: 54 in 137 cm Weight: 275 lbm 125 kg Multiple Station Broad Port: Frequency: All FM Broadcast Channels (88 to 108MHz) Connector: 3-1/8-inch, 4-1/16-inch, or 6-1/8-inch EIA, 50 ohms VSWR 1 : <1.06:1 Insertion Loss 2 : -0.05dB Typical Group Delay 3 : <75ns Overall Variation, Carrier ± 150kHz Injected Station Port Performance: Frequency 4 : All FM Broadcast Channels (88 to 108MHz) Power Rating: 39 kw Connector: 3-1/8-inch 50-Ohm EIA (flanged) VSWR 1 : <1.06:1 at ±150 khz Insertion Loss 2 : <0.45 db without GDC Module <0.70 db with GDC Module Group Delay 3 : <75 nsec overall variation ±150 khz <25 nsec overall variation ±150 khz with optional Group Delay Compensation 1) When terminated in 50-Ohm resistive load. 2) Loss values will be somewhat greater for frequency separations less than 2.0 MHz. 3) Group delay correction required for frequency separations less than 2.0 MHz. 4) 800 khz or more removed from any signal appearing at the broad port.

3 Model: (3-1/8-inch output) Weight: 840 lbm 381 kg ERI Model Constant Impedance FM Combiner Module, 3-1/8-inch output (convection cooled)

4 Model: (6-1/8-inch output) Weight: 950 lbm 431 kg ERI Model Constant Impedance FM Combiner Module, 6-1/8-inch output (convection cooled)

5 Model: (3-1/8-inch output) Length: 160 in 406 cm Weight: 1115 lbm 506 kg ERI Model Constant Impedance FM Combiner Module, 3-1/8-inch output, with optional high level group delay compensation (convection cooled)

6 Model: (6-1/8-inch output) Length: 160 in 406 cm Weight: 1225 lbm 556 kg ERI Model Constant Impedance FM Combiner Module, 6-1/8-inch output, with optional high level group delay compensation (convection cooled)

7 Model: (3-1/8-inch output) Height: 56 in 142 cm Weight: 1000 lbm 454 kg ERI Model Constant Impedance FM Combiner Module, 3-1/8-inch output (forced air cooling)

8 Model: (6-1/8-inch output) Height: 56 in 142 cm Weight: 1110 lbm 503 kg ERI Model Constant Impedance FM Combiner Module, 6-1/8-inch output (forced air cooling)

9 Model: (3-1/8-inch output) Height: 56 in 142 cm Length: 160 in 406 cm Weight: 1275 lbm 578 kg ERI Model Constant Impedance FM Combiner Module, 3-1/8-inch output, with optional high level group delay compensation (forced air cooling)

10 Model: (6-1/8-inch output) Height: 56 in 142 cm Length: 160 in 406 cm Weight: 1385 lbm 628 kg ERI Model Constant Impedance FM Combiner Module, 6-1/8-inch output, with optional high level group delay compensation (forced air cooling)

11 Model: 780 Group Delay Module Length: 54 in 137 cm Weight: 275 lbm 125 kg ERI Model 780 High Level Group Delay Compensation Module

12 Model: (3-1/8-inch output) Height: 110 in 279 cm Width: 45 in 114 cm Length: 52 in 132 cm Weight: 1090 lbm 494 kg ERI Model Constant Impedance FM Combiner Module, 3-1/8-inch output, mounted in optional floor stand (convection cooled)

Model: 780-8 (6-1/8-inch output) Height: 110 in 279 cm Width: 45 in 114 cm Length: 52 in 132 cm Weight: 1200 lbm 544 kg

13 Model: (6-1/8-inch output) Height: 110 in 279 cm Width: 45 in 114 cm Length: 52 in 132 cm Weight: 1200 lbm 544 kg ERI Model Constant Impedance FM Combiner Module, 6-1/8-inch output, mounted in optional floor stand (convection cooled)

14 Model: (3-1/8-inch output) Height: 110 in 279 cm Width: 45 in 114 cm Length: 63 in 160 cm Weight: 1250 lbm 567 kg ERI Model Constant Impedance FM Combiner Module, 3-1/8-inch output, mounted in optional floor stand (forced air cooling)

15 Model: (6-1/8-inch output) Height: 110 in 279 cm Width: 45 in 114 cm Length: 63 in 160 cm Weight: 1360 lbm 617 kg ERI Model Constant Impedance FM Combiner Module, 6-1/8-inch output, mounted in optional floor stand (forced air cooling)

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